GENERATING action and expressed MATHEMATICALLY as\({E_b} = \frac{{ZP\phi N}}{A}\)Eb = V – Ia RaWhere,Z = number of conductorsP = number of polesϕ = Magnetic flux in weber​N = speed of the motor in rpmA = number of parallel pathV = TERMINAL voltageIa = Armature currentRa = Armature resistanceWhen the armature winding of a dc motor starts rotating in the magnetic flux produced by the field winding, it cuts the lines of magnetic flux.Hence according to Faraday's laws of electromagnetic induction, there will be an induced emf in the armature winding.As per Lenz’s law, this induced emf acts in the opposite direction to the armature VOLTAGE. Hence the emf is called as the back emf and is denoted by Eb.The back emf is proportional to the speed ‘N’. It is zero at standstill.Back emf opposes the supply voltage and LIMITS the armature current to a safe value.The supply voltage induces the current in the coil which rotates the armature. The electrical work required by the motor for causing the current against the back emf is converted into mechanical energy.So that energy is induced in the armature of the motor. Thus, the energy conversion in DC motor is possible only because of the back emf.

"> GENERATING action and expressed MATHEMATICALLY as\({E_b} = \frac{{ZP\phi N}}{A}\)Eb = V – Ia RaWhere,Z = number of conductorsP = number of polesϕ = Magnetic flux in weber​N = speed of the motor in rpmA = number of parallel pathV = TERMINAL voltageIa = Armature currentRa = Armature resistanceWhen the armature winding of a dc motor starts rotating in the magnetic flux produced by the field winding, it cuts the lines of magnetic flux.Hence according to Faraday's laws of electromagnetic induction, there will be an induced emf in the armature winding.As per Lenz’s law, this induced emf acts in the opposite direction to the armature VOLTAGE. Hence the emf is called as the back emf and is denoted by Eb.The back emf is proportional to the speed ‘N’. It is zero at standstill.Back emf opposes the supply voltage and LIMITS the armature current to a safe value.The supply voltage induces the current in the coil which rotates the armature. The electrical work required by the motor for causing the current against the back emf is converted into mechanical energy.So that energy is induced in the armature of the motor. Thus, the energy conversion in DC motor is possible only because of the back emf.

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What is the back emf E of the Shunt DC motor functioning with a terminal Voltage of V and Armature current I and Armature resistance R?

General Knowledge General Awareness in General Knowledge . 6 months ago

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The back emf gets produced due to the GENERATING action and expressed MATHEMATICALLY as\({E_b} = \frac{{ZP\phi N}}{A}\)Eb = V – Ia RaWhere,Z = number of conductorsP = number of polesϕ = Magnetic flux in weber​N = speed of the motor in rpmA = number of parallel pathV = TERMINAL voltageIa = Armature currentRa = Armature resistanceWhen the armature winding of a dc motor starts rotating in the magnetic flux produced by the field winding, it cuts the lines of magnetic flux.Hence according to Faraday's laws of electromagnetic induction, there will be an induced emf in the armature winding.As per Lenz’s law, this induced emf acts in the opposite direction to the armature VOLTAGE. Hence the emf is called as the back emf and is denoted by Eb.The back emf is proportional to the speed ‘N’. It is zero at standstill.Back emf opposes the supply voltage and LIMITS the armature current to a safe value.The supply voltage induces the current in the coil which rotates the armature. The electrical work required by the motor for causing the current against the back emf is converted into mechanical energy.So that energy is induced in the armature of the motor. Thus, the energy conversion in DC motor is possible only because of the back emf.

Posted on 30 Nov 2024, this text provides information on General Knowledge related to General Awareness in General Knowledge. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.

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